/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.skywalking.mqe.rt.type;

public enum ExpressionResultType {

    /**
     * Can't resolve the type of the given expression.
     */
    UNKNOWN,
    /**
     * A single value
     */
    SINGLE_VALUE,
    /**
     * A collection of time-series values.
     * The value could have labels or not.
     */
    TIME_SERIES_VALUES,
    /**
     * A collection of aggregated values through metric sort function.
     */
    SORTED_LIST,
    /**
     * A collection of sampled records.
     * When the original metric type is sampled records.
     */
    RECORD_LIST
}
